单项选择题

He ______ but ______ nothing.

A．heard; listened
B．listened; heard
C．listened to; heard
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单项选择题
At the age of eleven, my grandfather ______ to work in a factory.
A．began
B．has begun
C．will begin
单项选择题
Mary told me that the story book must ______ to the library in two days.
A．be return
B．be returned
C．been returned
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